National September 11 Memorial Museum

The long awaited National September 11 Memorial Museum opened to the public on May 21 following a six-day dedication period for 9/11 families, survivors, first responders, workers, and local city residents. For the dedication period the doors to the museum will be open for 24-hours a day from May 15 through May 20.

By compiled from wire photos

on May 14, 2014 9:05 PM

Photo: Spencer Platt/Getty Images

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The National 9/11 Flag is furled by New York City firemen during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag was transferred into the museum's permanent collection. less

The National 9/11 Flag is furled by New York City firemen during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag was transferred into the ... more

Photo: DON EMMERT, AFP/Getty Images

The National 9/11 Flag is furled by New York City firemen during a... Photo-6335524.85778 - Houston Chronicle

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With One World Trade Center in the background, the National 9/11 Flag is unfurled during a ceremony at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the National September 11 Memorial Museum. After the flag was refolded, firefighters marched it into the museum. (AP Photo/Craig Ruttle) less

With One World Trade Center in the background, the National 9/11 Flag is unfurled during a ceremony at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the ... more

Photo: Craig Ruttle, Associated Press

With One World Trade Center in the background, the National 9/11... Photo-6335958.85778 - Houston Chronicle

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Groups of children join firefighters, police, members of the military and the public in participating in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum permanent collection on May 21, 2014 in New York City. The giant American Flag, which was flying from a building beside the World Trade Center on September 11, 2001 and was later found badly damaged in the debris of ground zero, was unfurled at the World Trade Center site in a ceremony. The flag was refolded and firefighters marched it into the museum. The National September 11 Memorial Museum opened its doors to the general public today. less

Groups of children join firefighters, police, members of the military and the public in participating in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum ... more

Photo: Spencer Platt, Getty Images

Groups of children join firefighters, police, members of the... Photo-6335523.85778 - Houston Chronicle

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The National 9/11 Flag is held by New York City firemen during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag was transferred into the museum's permanent collection. less

The National 9/11 Flag is held by New York City firemen during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag was transferred into the ... more

Photo: DON EMMERT, AFP/Getty Images

The National 9/11 Flag is held by New York City firemen during a... Photo-6335525.85778 - Houston Chronicle

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Genevive Amoncio, 17, of Levittown, N.Y., wipes a tear while standing by the National 9/11 Flag is at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the National September 11 Memorial Museum. After the flag was refolded, firefighters marched it into the museum. The flag was flying from a building near the World Trade Center on Sept. 11, 2001. It was later found shredded in the debris of ground zero. less

Genevive Amoncio, 17, of Levittown, N.Y., wipes a tear while standing by the National 9/11 Flag is at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the ... more

The hands of a fireman are seen as members of the public hold the National 9/11 Flag during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag was transferred into the museum's permanent collection. less

The hands of a fireman are seen as members of the public hold the National 9/11 Flag during a ceremony marking the opening of the 9/11 Memorial Museum on May 21, 2014 in New York. After the ceremony the flag ... more

Photo: DON EMMERT, AFP/Getty Images

The hands of a fireman are seen as members of the public hold the... Photo-6335527.85778 - Houston Chronicle

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Firefighters help fold the flag as they participate in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum permanent collection on May 21, 2014 in New York City.

Firefighters help fold the flag as they participate in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum permanent collection on May 21, 2014 in New York City.

Photo: Spencer Platt, Getty Images

Firefighters help fold the flag as they participate in the... Photo-6335530.85778 - Houston Chronicle

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Firefighters help fold the flag as they participate in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum permanent collection on May 21, 2014 in New York City.

Firefighters help fold the flag as they participate in the ceremonial transfer of the National 9/11 Flag into the The National September 11 Memorial Museum permanent collection on May 21, 2014 in New York City.

Photo: Spencer Platt, Getty Images

Firefighters help fold the flag as they participate in the... Photo-6335538.85778 - Houston Chronicle

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The National 9/11 Flag is carried by firefighters to the 9/11 Memorial Museum after a ceremony at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the National September 11 Memorial Museum. After the flag was refolded, firefighters marched it into the museum. The flag was flying from a building near the World Trade Center on Sept. 11, 2001. It was later found shredded in the debris of ground zero. less

The National 9/11 Flag is carried by firefighters to the 9/11 Memorial Museum after a ceremony at the 9/11 Memorial in New York Wednesday, May 21, 2014. The ceremony Wednesday marked the opening of the ... more

Photo: Craig Ruttle, Associated Press

The National 9/11 Flag is carried by firefighters to the 9/11... Photo-6335541.85778 - Houston Chronicle

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The reflective windows of the 9/11 Memorial Museum rise above some of the first public visitors to arrive at the site in New York Wednesday, May 21, 2014. Today marked the first day the 9/11 Memorial Museum was opened to the public. less

The reflective windows of the 9/11 Memorial Museum rise above some of the first public visitors to arrive at the site in New York Wednesday, May 21, 2014. Today marked the first day the 9/11 Memorial Museum was ... more

With an image of the former World Trade Center seen through the reflective windows of the 9/11 Memorial Museum, some of the first public visitors can be seen arriving at the site in New York Wednesday, May 21, 2014. Today marked the first day the 9/11 Memorial Museum was opened to the public. less

With an image of the former World Trade Center seen through the reflective windows of the 9/11 Memorial Museum, some of the first public visitors can be seen arriving at the site in New York Wednesday, May 21, ... more

Photo: Craig Ruttle, Associated Press

With an image of the former World Trade Center seen through the... Photo-6335543.85778 - Houston Chronicle

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President Barack Obama, first lady Michelle Obama, former New York City Mayor Michael Bloomberg, former Secretary of State Hillary Rodham Clinton, former President Bill Clinton, and Diana Taylor, tour the Memorial Hall at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. less

President Barack Obama, first lady Michelle Obama, former New York City Mayor Michael Bloomberg, former Secretary of State Hillary Rodham Clinton, former President Bill Clinton, and Diana Taylor, tour the ... more

Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. less

Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, ... more

President Barack Obama talks with Ling Young, left, and Alison Crowther before their remarks during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. Young was working on the 86th floor of the South Tower and was one of 12 people who escaped the sky lobby after Flight 175 struck the World Trade Center. Crowther is the mother of Welles Crowther who was killed on September 11 while assisting in the evacuation efforts in the South Tower. less

President Barack Obama talks with Ling Young, left, and Alison Crowther before their remarks during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, ... more

First responders from the FDNY and Port Authority exit the stage during the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. less

First responders from the FDNY and Port Authority exit the stage during the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New ... more

Photo: Charles Eckert, Associated Press

First responders from the FDNY and Port Authority exit the stage... Photo-6308683.85778 - Houston Chronicle

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US President Barack Obama is accompanied by former New York Mayor Michael Bloomberg as he tours the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum commemorating the September 11, 2001 terrorist attacks. less

US President Barack Obama is accompanied by former New York Mayor Michael Bloomberg as he tours the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum ... more

Photo: JEWEL SAMAD, AFP/Getty Images

US President Barack Obama is accompanied by former New York Mayor... Photo-6308684.85778 - Houston Chronicle

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An image of one of the original World Trade Center Towers is displayed in the window of the 9/11 Memorial Museum pavilion dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. less

An image of one of the original World Trade Center Towers is displayed in the window of the 9/11 Memorial Museum pavilion dedication ceremony at the National September 11 Memorial Museum in New York on ... more

Photo: Anthony Behar, Associated Press

An image of one of the original World Trade Center Towers is... Photo-6308685.85778 - Houston Chronicle

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Former New York Gov. George Pataki speaks as photos of 9/11 victims are projected, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. less

Former New York Gov. George Pataki speaks as photos of 9/11 victims are projected, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, ... more

Photo: Richard Drew, Associated Press

Former New York Gov. George Pataki speaks as photos of 9/11 victims... Photo-6308686.85778 - Houston Chronicle

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President Barak Obama speaks about Wells Crowther and Ling Young during the dedication ceremony at the National September 11 Memorial Museum Thursday, May 15th, 2014, New York.

President Barak Obama speaks about Wells Crowther and Ling Young during the dedication ceremony at the National September 11 Memorial Museum Thursday, May 15th, 2014, New York.

People watch a live video from the Ground Zero memorial site of the dedication ceremony of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

People watch a live video from the Ground Zero memorial site of the dedication ceremony of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

Photo: Spencer Platt, Associated Press

People watch a live video from the Ground Zero memorial site of the... Photo-6308688.85778 - Houston Chronicle

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New York Governor Andrew M. Cuomo speaks at the dedication ceremony for the National 9/11 Memorial Museum on May 15, 2014 in New York City. The museum memorializes the September 11 attacks on the World Trade Center in New York. less

New York Governor Andrew M. Cuomo speaks at the dedication ceremony for the National 9/11 Memorial Museum on May 15, 2014 in New York City. The museum memorializes the September 11 attacks on the World Trade ... more

Former New York Mayor Rudolph Giuliani, left, greets New York City firefighter Mickey Kross before his speech during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. less

Former New York Mayor Rudolph Giuliani, left, greets New York City firefighter Mickey Kross before his speech during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in ... more

Photo: Richard Drew, Associated Press

Former New York Mayor Rudolph Giuliani, left, greets New York City... Photo-6308690.85778 - Houston Chronicle

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Former New York City Mayor Rudolph Giuliani greets New York City Fireman at the dedication of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014.

Former New York City Mayor Rudolph Giuliani greets New York City Fireman at the dedication of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014.

Photo: TIMOTHY A. CLARY, Associated Press

Former New York City Mayor Rudolph Giuliani greets New York City... Photo-6308691.85778 - Houston Chronicle

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A woman wears a photograph of a victim of the September 11 2001 attacks on the World Trade Center around her neck as she attends the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. The museum, commemorating the Sept. 11, 2001 attacks on New York and Washington opens to the public on May 21, with wrenchingly familiar sights as well as artifacts never before on public display. less

A woman wears a photograph of a victim of the September 11 2001 attacks on the World Trade Center around her neck as she attends the dedication ceremony at the National September 11 Memorial Museum in New York, ... more

Photo: MIKE SEGAR, Associated Press

A woman wears a photograph of a victim of the September 11 2001... Photo-6308692.85778 - Houston Chronicle

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President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

People watch a live video from the Ground Zero memorial site of the dedication ceremony of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

People watch a live video from the Ground Zero memorial site of the dedication ceremony of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York.

Photo: Spencer Platt, Associated Press

People watch a live video from the Ground Zero memorial site of the... Photo-6308694.85778 - Houston Chronicle

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Connie Dorner of Camarillo, Calif., cries as she stands at memorial plaza to view the program on a television monitor during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. less

Connie Dorner of Camarillo, Calif., cries as she stands at memorial plaza to view the program on a television monitor during the dedication ceremony at the National September 11 Memorial Museum in New York, ... more

People watch a live video from the Ground Zero memorial site of President Barack Obama during the dedication ceremony of the National September 11 Memorial Museum in New York on May 15, 2014. The museum spans seven stories, mostly underground, and contains artifacts from the attack on the World Trade Center Towers on September 11, 2001 that include the 80 ft high tridents, the so-called "Ground Zero Cross," the destroyed remains of Company 21's New York Fire Department Engine as well as smaller items such as letter that fell from a hijacked plane and posters of missing loved ones projected onto the wall of the museum. The museum will open to the public on May 21. less

People watch a live video from the Ground Zero memorial site of President Barack Obama during the dedication ceremony of the National September 11 Memorial Museum in New York on May 15, 2014. The museum spans ... more

Photo: Spencer Platt, Associated Press

People watch a live video from the Ground Zero memorial site of... Photo-6308697.85778 - Houston Chronicle

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US President Barack H. Obama at the dedication of the national September 11th Memorial Museum in New York, Thursday, May 15, 2014.

US President Barack H. Obama at the dedication of the national September 11th Memorial Museum in New York, Thursday, May 15, 2014.

Photo: TIMOTHY A. CLARY, Associated Press

US President Barack H. Obama at the dedication of the national... Photo-6308698.85778 - Houston Chronicle

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From left, Former U.S. President Bill Clinton sits with his wife former U.S. Secretary of State Hillary Clinton, former New York Governor George Pataki and former New York City Mayor Rudolph Giuliani during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. less

From left, Former U.S. President Bill Clinton sits with his wife former U.S. Secretary of State Hillary Clinton, former New York Governor George Pataki and former New York City Mayor Rudolph Giuliani during the ... more

Photo: MIKE SEGAR, Associated Press

From left, Former U.S. President Bill Clinton sits with his wife... Photo-6308701.85778 - Houston Chronicle

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US President Barack Obama speaks as an image of the twin towers are projected during a ceremony at the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum commemorating the September 11, 2001 terrorist attacks. less

US President Barack Obama speaks as an image of the twin towers are projected during a ceremony at the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum ... more

Photo: JEWEL SAMAD, AFP/Getty Images

US President Barack Obama speaks as an image of the twin towers are... Photo-6308703.85778 - Houston Chronicle

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Two people embrace while gathered on the plaza of the National September 11 Memorial to watch the telecast of the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. less

Two people embrace while gathered on the plaza of the National September 11 Memorial to watch the telecast of the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May ... more

Photo: JUSTIN LANE, Associated Press

Two people embrace while gathered on the plaza of the National... Photo-6308704.85778 - Houston Chronicle

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President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum opens to the public on May 21.

President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum opens to the public on May 21.

A woman in the audience dries a tear during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014.

A woman in the audience dries a tear during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014.

Photo: Richard Drew, Associated Press

A woman in the audience dries a tear during the dedication ceremony... Photo-6308706.85778 - Houston Chronicle

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A New York City firefighter looks at the last column recovered at the World Trade Center site at the dedication ceremony for the National 9/11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum memorializes the September 11 attacks on the World Trade Center in New York. less

A New York City firefighter looks at the last column recovered at the World Trade Center site at the dedication ceremony for the National 9/11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum ... more

Photo: JOHN ANGELILLO, Associated Press

A New York City firefighter looks at the last column recovered at... Photo-6308707.85778 - Houston Chronicle

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US President Barack Obama is accompanied by former New York Mayor Michael Bloomberg as he tours the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum commemorating the September 11, 2001 terrorist attacks. less

US President Barack Obama is accompanied by former New York Mayor Michael Bloomberg as he tours the National September 11 Memorial & Museum on May 15, 2014 in New York. Obama inaugurated the museum ... more

Photo: JEWEL SAMAD, AFP/Getty Images

US President Barack Obama is accompanied by former New York Mayor... Photo-6308708.85778 - Houston Chronicle

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Fog looms lover the memorial plaza during the dedication ceremony for National September 11 Memorial Museum in New York, Thursday, May 15, 2014.

Fog looms lover the memorial plaza during the dedication ceremony for National September 11 Memorial Museum in New York, Thursday, May 15, 2014.

A view of the National September 11 Memorial Museum with the north reflecting pool in foreground during the museum's dedication ceremony Thursday, May 15, 2014 in New York.

A view of the National September 11 Memorial Museum with the north reflecting pool in foreground during the museum's dedication ceremony Thursday, May 15, 2014 in New York.

Photo: JUSTIN LANE, Associated Press

A view of the National September 11 Memorial Museum with the north... Photo-6308710.85778 - Houston Chronicle

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Reflection of members of the general public in the glass facade of the 9/11 Memorial Museum pavilion during the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. less

Reflection of members of the general public in the glass facade of the 9/11 Memorial Museum pavilion during the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, ... more

Photo: Anthony Behar, Associated Press

Reflection of members of the general public in the glass facade of... Photo-6308712.85778 - Houston Chronicle

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Cards, patches and mementos of those killed at Ground Zero are are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the public on May 21 following a six-day dedication period for 9/11 families, survivors, first responders, workers, and local city residents. For the dedication period the doors to the museum will be open for 24-hours a day from May 15 through May 20. On Thursday President Barack Obama and the first lady will attend the dedication ceremony for the opening of the museum. less

Cards, patches and mementos of those killed at Ground Zero are are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the ... more

Photo: Spencer Platt, Getty Images

Cards, patches and mementos of those killed at Ground Zero are are... Photo-6303982.85778 - Houston Chronicle

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An American flag found at the World Trade Center site (below) and a photograph of a flag raising at the site by Thomas E. Franklin/The Record (Bergen County, New Jersey) (top), seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York. less

An American flag found at the World Trade Center site (below) and a photograph of a flag raising at the site by Thomas E. Franklin/The Record (Bergen County, New Jersey) (top), seen during a press preview of ... more

Photo: STAN HONDA, AFP/Getty Images

An American flag found at the World Trade Center site (below) and a... Photo-6303981.85778 - Houston Chronicle

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Escalators going up to street level past a section of steel facade from the North Tower, floors 96 to 99, (L) seen during a press preview in the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York. less

Escalators going up to street level past a section of steel facade from the North Tower, floors 96 to 99, (L) seen during a press preview in the National September 11 Memorial Museum at the World Trade Center ... more

A display of front pages of newspapers, seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York.

A display of front pages of newspapers, seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York.

Photo: STAN HONDA, AFP/Getty Images

A display of front pages of newspapers, seen during a press preview... Photo-6303985.85778 - Houston Chronicle

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The "Survior Stairs", remnants of a Vesey Street staircase where many people who worked at the World Trade Center towers during the September 11, 2001 attack escaped to the street, seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York. less

The "Survior Stairs", remnants of a Vesey Street staircase where many people who worked at the World Trade Center towers during the September 11, 2001 attack escaped to the street, seen during a press preview ... more

A section of steel facade from the North Tower, floors 96 to 99, seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York.

A section of steel facade from the North Tower, floors 96 to 99, seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York.

Photo: STAN HONDA, AFP/Getty Images

A section of steel facade from the North Tower, floors 96 to 99,... Photo-6303988.85778 - Houston Chronicle

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The only World Trade Center presentation model still in existence is viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City.

The only World Trade Center presentation model still in existence is viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City.

Photo: Spencer Platt, Getty Images

The only World Trade Center presentation model still in existence... Photo-6303989.85778 - Houston Chronicle

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A firefighters shirt used at Ground Zero on September 11 is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New York City.

A firefighters shirt used at Ground Zero on September 11 is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New York City.

Photo: Spencer Platt, Getty Images

A firefighters shirt used at Ground Zero on September 11 is viewed... Photo-6303991.85778 - Houston Chronicle

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A photograph of the World Trade Center after the September 11, 2001 attacks (L) and a column and facade segment (R) seen during a press preview of the National September 11 Memorial Museum at the World Trade Center site May 14, 2014 in New York. less

A photograph of the World Trade Center after the September 11, 2001 attacks (L) and a column and facade segment (R) seen during a press preview of the National September 11 Memorial Museum at the World Trade ... more

Photo: STAN HONDA, AFP/Getty Images

A photograph of the World Trade Center after the September 11, 2001... Photo-6303996.85778 - Houston Chronicle

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The salvaged tridents from the World Trade Center are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City.

The salvaged tridents from the World Trade Center are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City.

Photo: Spencer Platt, Getty Images

The salvaged tridents from the World Trade Center are viewed during... Photo-6304000.85778 - Houston Chronicle

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The bullhorn President George W. Bush used to speak to first responders and the public at Ground Zero on September 14 is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New York City. less

The bullhorn President George W. Bush used to speak to first responders and the public at Ground Zero on September 14 is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New ... more

Photo: Spencer Platt, Getty Images

The bullhorn President George W. Bush used to speak to first... Photo-6304001.85778 - Houston Chronicle

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A wall with a quote from Virgil and featuring 2,983 panels for each victim is viewed during a tour of the National September 11 Memorial Museum on May 14, 2014 in New York City.

A wall with a quote from Virgil and featuring 2,983 panels for each victim is viewed during a tour of the National September 11 Memorial Museum on May 14, 2014 in New York City.

Photo: Spencer Platt, Getty Images

A wall with a quote from Virgil and featuring 2,983 panels for each... Photo-6304002.85778 - Houston Chronicle

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A decorated pillar from Ground Zero and the Slurry Wall are viewed during a tour of the National September 11 Memorial Museum on May 14, 2014 in New York City.

A decorated pillar from Ground Zero and the Slurry Wall are viewed during a tour of the National September 11 Memorial Museum on May 14, 2014 in New York City.

Photo: Spencer Platt, Getty Images

A decorated pillar from Ground Zero and the Slurry Wall are viewed... Photo-6304003.85778 - Houston Chronicle

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Dust, ash and debris from the collapsed Twin Towers are viewed on the clothes from the store Chelsea Jeans in an exhibit at viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City. less

Dust, ash and debris from the collapsed Twin Towers are viewed on the clothes from the store Chelsea Jeans in an exhibit at viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 ... more

In this May 5, 2014 photo released by the National September 11 Memorial Museum, a firetruck, damaged in the attacks of September 11, 2001, is on display at the New York museum.

In this May 5, 2014 photo released by the National September 11 Memorial Museum, a firetruck, damaged in the attacks of September 11, 2001, is on display at the New York museum.

Photo: Jin Lee, Associated Press

In this May 5, 2014 photo released by the National September 11... Photo-6304005.85778 - Houston Chronicle

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In this May 5, 2014 photo released by the National September 11 Memorial Museum, a piece of airplane damaged in the attacks of September 11, 2001, is displayed at the New York museum. The long-delayed museum will be dedicated during a ceremony Thursday, May 15, 2014. less

In this May 5, 2014 photo released by the National September 11 Memorial Museum, a piece of airplane damaged in the attacks of September 11, 2001, is displayed at the New York museum. The long-delayed museum ... more

Photo: Jin Lee, Associated Press

In this May 5, 2014 photo released by the National September 11... Photo-6304006.85778 - Houston Chronicle

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People tour the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the public on May 21 following a six-day dedication period for 9/11 families, survivors, first responders, workers, and local city residents. less

People tour the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the public on May 21 following a six-day dedication period for 9/11 families, ... more

Photo: Spencer Platt, Getty Images

People tour the National September 11 Memorial Museum on May 14,... Photo-6304007.85778 - Houston Chronicle

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The personal identification of Glenn J. Winuk, who was killed at Ground Zero on September 11, is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New York City.

The personal identification of Glenn J. Winuk, who was killed at Ground Zero on September 11, is viewed during a tour the National September 11 Memorial Museum on May 14, 2014 in New York City.